閥盖加工工艺规程及工装夹具设计书.docVIP

毕业设计 阀盖加工工艺规程及工装夹具设计 摘要 零件的加工工艺编制，在机械加工中占有非常重要的地位零件工艺编制得合不合理，这直接关系到零件最终能否达到质量要求，夹具的设计也是不可缺少的一部分 ，它关系到能否提高其加工效率的问 题。因此这两者在机械加工行业中是至关重要的环节。 阀盖零件的主要加工表面为孔和外圆表面。外圆表面加工根据精度要求可选择车削和磨削。孔加工方 法的选择比较复杂 ，需要考虑零件的结构特点 、孔径大小 、长径比 、精度和粗糙度要求以及生产规模等各种因素 。对于精度要求较高的孔往往还要采用几种不同的方法顺次进行加工。 在机床上对零件进行机械加工时，为保证工件加工精度，首先要保证工件在机床上占有正确的位置，然后通过夹紧机构使工件在正确位置上固定不动 ，这一任务就是由机床夹具完成 。对于单件 、小批量生产，应尽量使用通用夹具 ，这样可以降低工件的生产成本 。但是由于通用夹具适用各种工件的装夹，所以夹，时往往比较费时间，并且操作复杂生产效率低，也难以保证加工精度，为此需设计专用夹具。 通过该课程设计，将所学理论与生产实践相结合，锻炼了自己分析问题、解决问题的能力，在这个过程中我独立地分析和解决了零件机械制造的工艺问题，设计了机床专用夹具的典型结构，提高了结构设计能力，为今后的工作进行了一次适应性锻炼，从而为以后打下了坚实的基础。 关键词：工艺设计；基准选择；切削用量；定位误差 THE VALVE COVER PROCESSING PROCEDURE AND FIXTURE DESIGN ABSTRACT Is the components craft establishment, holds the very important status in the machine-finishing, the Components craft establishes reasonable, whether do this direct relation components achieve the available quality requirement finally; Jigs design is also an essential part, whether does it relate raises its processing efficiency the question.Therefore this both in the machine-finishing are the important links. Sleeve components main processing surface for hole and outer annulus surface. The outer annulus face work needs to request according to the precision to be possible to choose the turning and the grinding. The hole processing methods choice is quite complex, needs to consider the components the unique feature, the aperture size, the length to diameter ratio, the precision and roughness request as well as the scale of production and soon each kind of factor. Of then must use several different methods regarding the accuracy requirement high hole to carry on the processing in order. This design s cylinder, will pass through half finished boring, the finished boring, the fine articulation and the trundle successively for the guarantee holes precision and the surface quality successively for the guarantee holes When the engine carries on the bed machi